A bus leaves the Fukushima Daiichi nuclear power plant in Japan.

A bus leaves the Fukushima Daiichi nuclear power plant in Japan.

Kimimasa Mayama / Pool Photo

A bus leaves the tsunami-stricken Fukushima Daiichi nuclear power plant. As Japan prepares to mark the anniversary of the disaster next month, officials say it may take decades to conduct a proper cleanup.

A bus leaves the tsunami-stricken Fukushima Daiichi nuclear power plant. As Japan prepares to mark the anniversary of the disaster next month, officials say it may take decades to conduct a proper cleanup. (Kimimasa Mayama / Pool Photo)

A bus leaves the tsunami-stricken Fukushima Daiichi nuclear power plant. As Japan prepares to mark the anniversary of the disaster next month, officials say it may take decades to conduct a proper cleanup.